Convert a Vec of i64 into a Vec of Strings in rust 10.10.25

```
 let vs: Vec<String> = v.into_iter().map(|n| n.to_string()).collect();

```

To convert a Vec<i64> into a Vec<String> in Rust, you can iterate over the Vec<i64>, convert each i64 element to a String, and then collect these Strings into a new Vec<String>.

According to www.iAsk.Ai - Ask AI:

The most idiomatic and efficient way to achieve this in Rust is by using the into_iter(), map(), and collect() methods. This approach leverages Rust's iterator adaptors for concise and performant transformations [1] [2].

Here's a step-by-step breakdown:

Start with your Vec<i64>: Let's assume you have a vector named my_i64_vec of type Vec<i64>.

let my_i64_vec: Vec<i64> = vec![1, 2, 3, 4, 5];

Convert the Vec into an iterator: The into_iter() method consumes the vector and produces an iterator that yields each element by value. This is generally preferred when you no longer need the original vector [3].

my_i64_vec.into_iter()

Map each element to a String: The map() method applies a closure to each element produced by the iterator. Inside this closure, you'll convert each i64 to a String. The to_string() method, available on all types that implement the Display trait (which i64 does), is perfect for this [4] [5].

.map(|n| n.to_string())

This step transforms an iterator of i64 into an iterator of String.

Collect the results into a new Vec<String>: The collect() method consumes the iterator and gathers the results into a specified collection type. In this case, we want a Vec<String> [3].

.collect::<Vec<String>>();

The type annotation ::<Vec<String>> is often necessary for collect() to infer the desired output type.

Combining these steps, the complete solution is:

let my_i64_vec: Vec<i64> = vec![1, 2, 3, 4, 5];
**let my_string_vec: Vec<String> = my_i64_vec.into_iter().map(|n| n.to_string()).collect();**
// my_string_vec will now be Vec<String> = ["1", "2", "3", "4", "5"]

This method is efficient because Rust's compiler is highly optimized for iterator chains, often inlining operations and avoiding intermediate allocations where possible [2]. This pattern is also widely used for type conversions on vectors in Rust, such as converting Vec<i64> to Vec<u64> using n as _ within the map closure [6].

For more complex scenarios where you might have a custom type like CourseName that wraps a String, you would implement the Display trait for your custom type. This allows to_string() to work correctly on instances of your custom type, enabling a similar map().collect() pattern

Tags: vecconvert, vecrust, vec2string

https://doc.rust-lang.org/rust-by-example/

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Convert a Vec of i64 into a Vec of Strings in rust 10.10.25

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